Replying to SUCCUBUS

Newschoolers, I have a dilemma. My roommate has recently acquired a girlfriend, leaving him a hollow shell of a man. He spends 12+ hours a day locked in his room doing god knows what with her, does everything she says, is in the slow painful process of reformulating his tastes and opinions to suit hers, and on top of all of that she sucks and smells like crabcakes. I'm really happy that my friend is now experiencing the wonders of a vagina, but I'm at a loss for how to talk to him about it. How have you driven evil female spirits out of your homes?